68643554 ÷ 13 
We're looking to find how many times 13 goes into 68643554.

On to step 1:
When dividing 6 by 13, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 13

Moving on to step 2:
When dividing 68 by 13, we get 5 with a remainder of 3.
Put 5 as the next digit of the answer. 
Result so far: 5.0
The remainder is 3 after subtracting 65 from 68.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 13

On to step 3:
When dividing 36 by 13, we get 2 with a remainder of 10.
The next digit of our result is 2. 
Result so far: 52.0
If we take 26 away from 36, we end up with 10.
Bring next digit (4) of the dividend behind the 10 and repeat the process: 104 / 13

Going ahead to step 4:
If we divide 104 by 13, we get 8 and a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 528.0
Deduct 104 from 104 and we're left with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 13

Advancing to step 5:
The number 13 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 5280.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 13

Let's proceed to step 6:
13 goes into 35 2 times with a remainder of 9.
Use 2 as the next digit of our solution. 
Result so far: 52802.0
Subtracting 26 from 35 leaves us with 9.
Grab the next digit (5) from the dividend, add it to 9, then carry on: 95 / 13

Moving on to step 7:
If we divide 95 by 13, we get 7 and a remainder of 4.
The next digit of our result is 7. 
Result so far: 528027.0
Deduct 91 from 95 and we're left with 4.
Include the next digit (4) from the dividend after 4, then repeat: 44 / 13

Going ahead to step 8:
If we divide 44 by 13, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 5280273.0
Deduct 39 from 44 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
13 goes into 50 3 times with a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 5280273.3
Subtracting 39 from 50 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 10:
110 divided by 13 is 8 with a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 5280273.38
Subtracting 104 from 110 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 11:
The number 13 fits into 60 4 times, leaving a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 5280273.384
If we take 52 away from 60, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 12:
80 divided by 13 is 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 5280273.3846
If we subtract 78 from 80, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 13:
The number 13 fits into 20 1 times, leaving a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 5280273.38461
If we subtract 13 from 20, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 14:
70 divided by 13 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 5280273.384615
The remainder is 5 after subtracting 65 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 15:
If we divide 50 by 13, we get 3 and a remainder of 11.
Use 3 as the next digit of our solution. 
Result so far: 5280273.3846153
Subtract 39 from 50 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 16:
If we divide 110 by 13, we get 8 and a remainder of 6.
The next digit of our result is 8. 
Result so far: 5280273.38461538
Subtracting 104 from 110 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final outcome is 5280273.38461538, with a leftover of 6e-09.